OKLAHOMA CITY--(BUSINESS WIRE)--Sonic Corp. (NASDAQ:SONC), the nation's largest chain of drive-in restaurants, today announced that its Board of Directors declared a quarterly cash dividend of $0.09 per share of common stock to be paid to shareholders of record as of the close of business on February 11, 2015, with a payment date of February 20, 2015. In addition to the dividend, the company has a $105 million share repurchase authorization for fiscal 2015. “Our commitment to return cash to our